The new dosage form is what pharmaceutical scientists call an oral lyophilisate, a tablet produced by freeze-drying a drug-containing solution or suspension inside a blister mold. Because the water is removed by sublimation rather than evaporation, the finished tablet is riddled with pores, giving it a sponge-like architecture. When placed on the tongue, saliva floods through those channels and the tablet falls apart within seconds, which is why oral lyophilisates are prized for children, older adults, and anyone who struggles to swallow conventional pills. Fast disintegration can also speed absorption and shorten the time it takes for a drug to start working. The trade-offs are real, however: freeze-drying is expensive and slow, and the resulting tablets are brittle, humidity-sensitive, and demand special packaging.

Ebastine posed a second challenge on top of the formulation hurdles. Under the Biopharmaceutics Classification System it is a Class II drug, meaning dissolution in the digestive tract is the bottleneck that constrains its bioavailability. With a log P of 7.64 and a molecular weight of 469.7 g/mol, the compound is a large, greasy molecule that is nearly insoluble in water. Freeze-drying rules also impose dose limits: water-insoluble drugs should not exceed 400 mg to preserve the porous structure, and drug particles should be smaller than 50 micrometers so they do not sediment during manufacturing or leave a gritty texture in the mouth. Ebastine’s poor solubility therefore made it an ideal candidate for nanosizing before it was ever mixed with tablet excipients.

The team’s answer was a vesicular carrier they describe as a Solusome, a modified lipid-based nanovesicle built from phosphatidylcholine bilayers with a solubilizing agent woven into the membrane. Unlike conventional liposomes, which can suffer from limited drug loading, leakage, and physical instability, Solusomes are designed to improve entrapment efficiency, membrane flexibility, and permeability. Unlike mixed micelles, they retain a bilayer capable of hosting both hydrophilic and lipophilic drugs. In this study the researchers prepared ebastine-loaded Solusomes by the thin-film hydration technique: the drug and phospholipid were dissolved in ethanol, evaporated under vacuum to leave a thin lipid film on the walls of a round-bottomed flask, and then hydrated with phosphate buffer containing Soluplus, a graft copolymer supplied by BASF that acts as the stabilizing agent. Bath sonication with repeated on-off cycles broke the dispersion down to a fine, aggregate-free suspension.

The particle measurements confirmed that the process worked. Dynamic light scattering showed the nanovesicles had a mean diameter of 65.86 nanometers with a polydispersity index of 0.1088 before concentration. After the dispersion was reduced in volume by rotary evaporation, a delicate step in which pressure and temperature were ramped gradually to prevent foaming, the particles measured 82.39 nanometers with a polydispersity index of 0.09213. Both sets of values fall comfortably within the ranges regarded as acceptable for pharmaceutical use, which matters because the concentrated vesicle dispersion had to survive the concentration step without aggregating before it could be blended with the tablet matrix.

Building the tablets themselves required a careful balance of four excipients. Gelatin served as the matrix-forming agent that gives the lyophilisate its structure, polyvinylpyrrolidone K90 acted as a hydrophilic binder, glycine functioned as a bulking agent and disintegration accelerant, and mannitol was added at a fixed 15 percent as a bulking agent with a pleasant mouthfeel. The concentrated Solusome dispersion was mixed with these components, poured into blister cavities, and freeze-dried in two stages: primary drying at minus 50 degrees Celsius under high vacuum, followed by secondary drying at 0 degrees Celsius. Rather than testing formulations one by one, the researchers used a Box-Behnken experimental design in Design-Expert software, which proposed 13 formulations varying the percentages of gelatin, PVP K90, and glycine across three levels each.

The statistical analysis revealed a clear tug-of-war between the two most important ingredients. Gelatin concentration had a highly significant effect on disintegration time: as the gelatin percentage rose, the tablets took longer to fall apart, because denser networks of cross-linked gelatin strands form harder, more rigid matrices that dissolve slowly. The same trend worked in reverse for friability, the measure of how much weight tablets lose when tumbled in a rotating drum. More gelatin meant fewer broken tablets, since stronger gels resist mechanical damage. PVP K90 showed the opposite pattern on disintegration, cutting the time dramatically as its percentage increased, thanks to its water-binding and complexing properties, although it had no significant effect on friability. Glycine, despite its theoretical role in creating aqueous channels, showed no statistically significant influence on either response.

The optimized formula, designated F7, combined 3 percent gelatin, 2.5 percent PVP K90, and 7.5 percent glycine, and achieved the highest desirability score in the design. Its mean disintegration time was 31.9 seconds, close to the 30-second benchmark set by the United States Pharmacopeia for orodispersible tablets, and its friability was 0.991 percent, just inside the 1 percent limit considered acceptable. In dissolution testing in hydrochloric acid at pH 1.2, the F7 tablets released more than 98 percent of the drug within 40 minutes, while pure ebastine managed only 42 percent over the same period. The researchers attribute this to the Noyes-Whitney equation: nanoscale vesicles present a vastly greater surface area and improved wettability, accelerating dissolution. Interestingly, the release profile was prolonged rather than instantaneous, which the team explains as controlled diffusion of the drug through the vesicular bilayer after the tablet disintegrates, not slow tablet breakdown.

Compatibility studies confirmed that the improvements came from physics rather than chemistry. Fourier transform infrared spectroscopy preserved all the characteristic absorption bands of ebastine, including ring C-H stretching near 3051 wavenumbers and ketonic carbonyl stretching at 1678 wavenumbers, with no new peaks or spectral shifts, ruling out chemical interaction or degradation during formulation and freeze-drying. Differential scanning calorimetry told a different story about the drug’s solid state: the melting endotherm of pure ebastine appeared at 85.96 degrees Celsius, but in the loaded nanovesicles the peak dropped to 82.44 degrees Celsius and diminished in intensity, suggesting partial conversion to an amorphous form. Powder X-ray diffraction reinforced this finding, showing that the sharp crystalline peaks of pure ebastine largely vanished in the vesicle formulation. Amorphization raises the free energy of the drug and improves wettability, which directly boosts dissolution without altering the molecule itself.

The most striking evidence came from the animal study. Male Wistar rats received either the F7 oral lyophilisate dispersed in water or a conventional aqueous suspension of pure ebastine, both by oral gavage at 10 milligrams per kilogram. Because ebastine undergoes extensive first-pass metabolism into its active metabolite carebastine, the researchers tracked carebastine in plasma by HPLC. The optimized formulation produced a maximum plasma concentration of 188.60 nanograms per milliliter at 4 hours, compared with 75.33 nanograms per milliliter for the suspension, and the area under the concentration-time curve reached 2670.32 nanogram-hours per milliliter against 701.9 for the pure drug, a statistically significant difference. Overall, the Solusome tablets raised oral bioavailability 3.21-fold. The authors caution that the preliminary pharmacokinetic study used only three rats per group, following the 3Rs principle to minimize animal use, and recommend larger studies to confirm the findings. Even so, the results suggest that pairing porous freeze-dried tablets with lipid nanovesicles could give poorly soluble drugs like ebastine a faster onset, easier swallowing, and substantially more drug delivered per dose.

Subject of Research: Development of ebastine-loaded Solusome nanovesicle oral lyophilisates with improved dissolution and bioavailability

Article Title: Formulation, in vitro , and in vivo evaluation of ebastine Solusome nanovesicle-based oral lyophilized tablets

Article References: Alkufi, H. K., Salih, O. S., & Taher, S. S. (2026). Formulation, in vitro, and in vivo evaluation of ebastine Solusome nanovesicle-based oral lyophilized tablets. Pharmacia, 73, Article e200581. https://doi.org/10.3897/pharmacia.73.e200581

Image Credits: AI Generated

DOI: 10.3897/pharmacia.73.e200581

Keywords: ebastine, Solusome nanovesicles, oral lyophilisates, orodispersible tablets, freeze-drying, Soluplus, drug bioavailability, nanotechnology, antihistamine, dissolution, pharmacokinetics, drug delivery

The active ingredient in the sensor is cobalt chloride, a salt with a long and well-documented history as a humidity indicator. In its anhydrous, or water-free, form, cobalt chloride is blue. When water vapor is present, the salt undergoes hydration: water molecules coordinate with the cobalt ions, altering the compound’s chemical structure and, with it, the way it absorbs and reflects light. The result is a dramatic and easily visible shift to pink. Because this transition is reversible, the sensor does not merely record a single event; it continuously tracks the moisture conditions inside a package, responding within seconds to changes in the surrounding environment. When the salt is dry, the sensor reads blue; when it becomes hydrated, it turns pink, signaling the presence of water vapor and, by extension, a potential loss of product quality.

What distinguishes the Brazilian team’s device from earlier humidity indicators is its physical form. Rather than a flat strip or a coating applied directly to packaging material, the sensor is a small cylinder fabricated from starch cryogel, a highly porous material the research group has been developing using a freeze-based manufacturing process. The starch gel is frozen and then subjected to freeze-drying, a dehydration technique in which the frozen water is removed by sublimation, passing directly from the solid state to vapor without ever becoming liquid again. This gentle removal of the aqueous phase preserves the delicate porous structure that forms during freezing, producing a scaffold with an enormous internal surface area and a high capacity for interacting with the surrounding atmosphere.

That large surface area is the key to the sensor’s sensitivity. Bianca Maniglia, a professor at IQSC-USP and the research advisor on the project, explained that the expanded contact area allows the device to register a wide range of humidity conditions inside packaging. In a very dry environment, the sensor responds by holding its blue state; in a very humid one, it responds by turning pink. The gradations between these extremes produce a spectrum of intermediate shades, giving the device a dynamic range that a simple yes-or-no indicator cannot match. In practical terms, this means the sensor does not just flag the presence of moisture but reflects the actual conditions the food is experiencing over time.

To validate the technology, the researchers turned to cream crackers, a product chosen deliberately for its vulnerability. Crackers belong to the class of low-moisture foods whose appeal depends almost entirely on texture: the snap of a crisp cracker is a direct consequence of its low water content, and even modest moisture uptake from the surrounding atmosphere is enough to soften it into staleness. The team placed the starch-based cylinders near crackers stored under different conditions and observed the color transitions. The results showed that the color change corresponded to increases in moisture and was strongly correlated with the loss of texture in the crackers, indicating that the sensor faithfully mirrors the real storage conditions that determine whether the product remains enjoyable or ends up disappointing the consumer.

The implications extend well beyond crackers. Any food whose quality depends on maintaining a moisture balance, from breakfast cereals and snack foods to powdered beverages and baked goods, could in principle be monitored this way. For manufacturers, a visual moisture sensor embedded in packaging would offer a way to verify that sealing processes are working, that transport and storage conditions have not compromised the product, and that shelf-life claims hold up in practice. For consumers, the promise is even more direct: a glance at the package, or a quick look through a cell phone screen, would reveal whether the contents are still crisp before the bag is ever opened. The researchers expect that, in the future, both industry and consumers will be able to use the technology to determine the crispness and moisture content of a wide variety of products.

The commercial stakes are considerable. According to recent data released by the Brazilian Packaging Association (ABRE), the packaging sector generates approximately 165.7 billion Brazilian reais per year in Brazil alone, and quality assurance is a significant share of the value embedded in that figure. Food waste driven by texture loss and perceived staleness represents a parallel cost, one borne by retailers, consumers, and the environment alike. A cheap, biodegradable indicator that communicates product condition in real time could help reduce waste by distinguishing between food that is genuinely past its best and food that is perfectly good but has merely passed a printed expiration date. Because the sensor’s matrix is starch, a renewable and biodegradable polymer, the device also avoids adding persistent plastic waste to the packaging stream it is meant to improve.

The inspiration behind the device is as charming as the chemistry is rigorous. While developing the project, Maniglia recalled the weather rooster, a kitchen ornament inspired by the Rooster of Barcelos, one of Portugal’s national symbols, that was common in Brazilian and Portuguese homes in the 1980s. The glazed ceramic rooster changed color to indicate whether the day would bring rain or sunshine, functioning as a household humidity gauge long before electronic sensors became ubiquitous. That childhood memory prompted the researchers to experiment with coating their sensor in the same kind of material used on the roosters, eventually adapting the approach to the cryogel platform. It is a fitting lineage: a folk technology for reading the weather reborn as a precision instrument for reading the inside of a snack bag.

Significant work remains before the sensor can reach supermarket shelves. The most important limitation is the cobalt chloride itself. Although effective as a color-switching salt, cobalt compounds raise toxicity concerns, and in its current form the sensor cannot be allowed to come into direct contact with food. Maniglia noted that for commercial use, conventional packaging would need to be redesigned to accommodate the sensor safely, keeping the cobalt chloride physically separated from the edible contents while still exposing it to the internal atmosphere of the package. Encapsulation strategies, barrier layers, and revised package geometries are all plausible routes, but each would require additional testing to confirm that the sensor’s responsiveness survives the modifications.

The research group is already exploring alternatives that could sidestep the toxicity problem entirely. Among the candidate materials are bioactive compounds derived from fruits, including pigments extracted from jabuticaba peel, the dark purple skin of a Brazilian grape beloved for its antioxidant properties. These natural pigments are sensitive to pH variations, exhibiting color changes that can serve as visual indicators, and they bring antioxidant activity as an added benefit. In that configuration, the researchers envision a system capable of monitoring the spoilage process of perishable foods such as meat, where microbial activity and chemical degradation shift the internal chemistry in ways the pigments could reveal. Maniglia also emphasized that incorporating these natural compounds adds commercial value to fruit-processing byproducts that would otherwise be discarded, closing the loop on an already sustainable concept. From a childhood memory of a color-changing rooster to a starch cryogel that reports the crispness of a cracker in real time, the project illustrates how curiosity-driven chemistry, rooted in everyday observation, can yield technologies with the potential to reshape how the world’s food is packaged, monitored, and trusted.

Subject of Research: A biodegradable starch cryogel sensor with cobalt chloride that visually indicates moisture and food crispness in packaging.

Article Title: Starch-based sensor changes color to indicate moisture in food packaging

Article References: Starch-based sensor changes color to indicate moisture in food packaging. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: food packaging, moisture sensor, cobalt chloride, starch cryogel, freeze-drying, food crispness, Food Chemistry, University of São Paulo, FAPESP, biodegradable materials, food quality, jabuticaba peel

Nanocrystal technology is one of the few bioavailability-enhancing strategies that has already been clinically validated and commercialized. The concept is straightforward: reduce the active pharmaceutical ingredient to particles in the nanometer range and stabilize their enormous surface energy with small amounts of polymers or surfactants. Because the drug itself is the carrier, nanocrystals achieve exceptionally high drug loading and can be adapted to many routes of administration, from oral tablets to injectable suspensions. According to the Noyes–Whitney relationship, dissolution rate increases as surface area grows, so nanosizing dramatically accelerates how quickly drug particles dissolve in the gastrointestinal tract. Beyond faster dissolution, nanocrystals also raise the apparent saturation solubility, since the increased surface free energy of very small particles creates a higher concentration gradient driving absorption, ultimately improving bioavailability for the poorly water-soluble compounds that dominate modern drug pipelines.

The review organizes the manufacturing landscape into three families of approaches. Top-down methods, such as wet media milling and high-pressure homogenization, break coarse crystals apart using mechanical forces. Wet media milling, in which drug suspensions are agitated with small grinding beads, is the workhorse of the industry because it is scalable, applies to nearly insoluble compounds and avoids organic solvents. Bottom-up methods, by contrast, build nanoparticles from dissolved molecules, most commonly through antisolvent precipitation, in which a drug solution is mixed with a poor solvent to trigger rapid nucleation. These approaches offer fine control over particle size but are sensitive to mixing dynamics and solvent removal challenges. Hybrid methods combine both principles—for example, precipitating a drug and then milling the resulting suspension—to exploit the strengths of each. The authors emphasize that each technique carries process-specific parameters that directly shape the critical quality attributes of the final product, from particle size distribution to dissolution behavior.

That sensitivity to process conditions is precisely why the review champions quality by design, or QbD, the regulatory philosophy codified in International Council for Harmonisation guidelines Q8, Q9 and Q12. Rather than testing quality into a finished product, QbD builds it in from the start. The workflow begins by defining a quality target product profile—the intended clinical performance of the medicine—and translating it into critical quality attributes such as particle size, zeta potential, crystallinity and dissolution rate. Risk assessment tools then identify which formulation variables, called critical material attributes, and which process parameters most strongly influence those attributes. Design of experiments is used to map the response surface, establish a design space within which quality is assured, and define control strategies that keep the process in its proven acceptable range throughout the product lifecycle.

Applied to wet media milling, the review’s flagship example, this framework becomes strikingly concrete. The quality target product profile dictates the critical quality attributes; milling parameters such as bead size, bead loading, milling speed, milling time, drug concentration and temperature are screened as critical process parameters. Stabilizer selection is treated with equal rigor: the type, concentration and physicochemical properties of polymers and surfactants are considered potential critical material attributes. Cellulosic polymers, poloxamers, polysorbates and even natural stabilizers such as tea saponins and proteins have all been explored, each interacting differently with the newly created crystal surfaces. The right stabilizer must wet the particles, adsorb rapidly onto fresh surfaces created during fracture, and provide either electrostatic or steric repulsion strong enough to prevent the particles from re-aggregating the moment milling stops.

Stabilization is not merely a matter of keeping particles apart; it is a battle against thermodynamics. The review details the principal physical instabilities that threaten nanosuspensions, including Ostwald ripening, in which small particles dissolve and redeposit onto larger ones because solubility increases with curvature, a phenomenon described classically by the Lifshitz–Slyozov–Wagner theory. Aggregation and sedimentation follow if the stabilizing layer is too weak, while uncontrolled crystallization can convert an amorphous surface layer back to a stable, slowly dissolving form. Because these instabilities accelerate with polydispersity and temperature, the choice of stabilizer concentration becomes a genuine design decision rather than a trial-and-error guess. QbD turns this chemistry into a controllable variable: by linking stabilizer attributes to measured quality outcomes through designed experiments, formulators can predict how a formulation will behave before it ever reaches the milling vessel.

Nanocrystal suspensions, however, are rarely the final dosage form. The review extends the QbD framework to solidification and scale-up, two stages where many promising formulations fail. Liquid nanosuspensions are physically fragile, so they are commonly converted into dry powders by spray drying, freeze-drying or fluidized bed coating onto carrier particles. Each drying method introduces its own risks: freeze-drying can cause particles to fuse during ice sublimation unless cryoprotectants are added, while spray drying exposes particles to heat and rapid evaporation that can induce aggregation or polymorphic changes. Scale-up compounds the difficulty, because milling efficiency depends on energy density and flow patterns that do not translate linearly from laboratory bead mills to production equipment. Mechanistic process modeling, the authors note, has been used to establish design spaces and control strategies for milled suspensions, offering a route to transfer a validated process across scales without re-deriving it from scratch.

The industrial credentials of the technology are substantial. Nanocrystal-based products have reached the market across multiple therapeutic areas and administration routes, including long-acting injectable suspensions for psychiatric and oncology indications, oral formulations and dermal applications. Recent research continues to expand the frontier: nanocrystals embedded in hydrogels for intratympanic delivery of dexamethasone to treat hearing loss, transdermal systems for rotigotine and meloxicam, ophthalmic suspensions, pulmonary formulations of budesonide, and even veterinary and agricultural uses such as herbicide nanosuspensions that suppress Ostwald ripening in the field. In oncology, sterile nanosuspensions of mebendazole and other agents are being explored for brain tumor therapy, while QbD-optimized nanocrystals of sotorasib, a KRAS inhibitor, demonstrate how modern targeted cancer drugs with extreme insolubility can be rescued by nanosizing combined with biosurfactant stabilization.

The review’s expert opinion distills a decade of accumulated evidence into a single message: nanocrystal development should be viewed as an integrated process in which particle properties, stabilization mechanisms, preparation methods, solidification and scale-up are closely interconnected. Treating these elements in isolation, the authors argue, is what historically made nanocrystal formulation slow and unpredictable. QbD supplies the connective tissue—a systematic understanding of how formulation variables and process parameters jointly determine quality attributes, enabling predictive development rather than iterative guesswork. As regulatory agencies worldwide continue to encourage lifecycle management and continuous improvement under ICH Q12, the authors conclude that QbD-based predictive development and quality control strategies will improve developmental efficiency and, crucially, accelerate the industrial and clinical translation of nanocrystal medicines, turning one of pharmaceutical science’s most versatile tools into a reliably engineered platform for the next generation of poorly soluble drugs.

Subject of Research: Application of quality by design principles to drug nanocrystal formulation, stabilization, manufacturing and industrial translation

Article Title: Application of quality by design in drug nanocrystal development: principles, stabilization, manufacturing strategies, and industrial applications

Article References: Jeong, J.-S., Ha, E.-S., Kim, J.-S., Yoon, N.-Y., Jung, H.-W., Kim, M.-G., Nam, J., Shin, E., Park, H., & Kim, M.-S. (2026). Application of quality by design in drug nanocrystal development: principles, stabilization, manufacturing strategies, and industrial applications. Journal of Pharmaceutical Investigation. https://doi.org/10.1007/s40005-026-00834-1

Image Credits: AI Generated

DOI: 10.1007/s40005-026-00834-1

Keywords: drug nanocrystals, quality by design, poorly water-soluble drugs, wet media milling, stabilizers, critical quality attributes, Ostwald ripening, bioavailability enhancement, spray drying, freeze-drying, pharmaceutical manufacturing, nanosuspensions

The study, published in Food Chemistry: X, is the first comprehensive comparison of the metabolomic, structural, and functional consequences of soaking, germination, pressure cooking, sand roasting, and freeze-drying in rice beans. The researchers collected roughly five kilograms of whole dried beans of the JCR-08-7 variety from local farms in Mizoram, Meghalaya, and Assam between October 2024 and April 2025, sorted them by hand to remove dust and stones, and then subjected 200-gram batches to each treatment. Because soaking is the first step in nearly all legume processing, every treatment began from pre-soaked beans, with simple soaking serving as the hydrated control against which the other methods were judged.

The analytical centrepiece of the work was untargeted metabolomics performed on a Thermo Orbitrap Eclipse Tribrid mass spectrometer coupled to a Dionex UltiMate 3000 liquid chromatography system. Samples extracted in methanol and water were separated on a reversed-phase C18 column and scanned in both positive and negative ionisation modes across a mass-to-charge range of 100 to 1000, at a resolving power of 60,000. From 10,533 raw spectral features, the team putatively annotated 283 metabolites that formed a shared core metabolome across all five treatments, with annotations supported by accurate mass measurements of less than five parts per million and by fragmentation patterns matched against spectral libraries. Pooled quality-control samples injected every ten runs ensured that only reproducible features were retained.

The metabolic fingerprints that emerged were strikingly distinct. Germinated beans yielded the most diverse profile, with 2,851 metabolite features detected, followed by pressure cooking at 2,300, freeze-drying at 2,167, soaking at 1,655, and sand roasting at 1,596. Principal component analysis separated the treatments cleanly, with the first two components explaining roughly 41 percent of the total variance, and hierarchical clustering confirmed that each processing method generated its own chemical signature. Soaked beans retained compounds such as catechin, itaconic acid, and L-histidine, while germination drove the accumulation of the flavonoids quercetin, kaempferol, and naringenin, a pattern consistent with activation of the phenylpropanoid pathway during sprouting. Sand roasting favoured thermostable phytochemicals such as genistein, daidzein, and gentisic acid, freeze-drying preserved heat-sensitive molecules including isorhamnetin, hyperoside, and coumarin, and pressure cooking produced a profile marked by lupeol, quinoline, and pinolenic acid.

Those molecular shifts translated directly into measurable nutrition. Protein content ranged from 17.3 percent in sand-roasted flour to 24.3 percent in germinated flour, the latter reflecting enzymatic mobilisation of nitrogenous reserves and the synthesis of new proteins during sprouting. Moisture fell to just 2.04 percent in freeze-dried samples, a level that promises improved storage stability, while ash content peaked in freeze-dried and sand-roasted beans as mineral constituents became concentrated after moisture removal. Pressure cooking and soaking, by contrast, leached soluble minerals into processing water, and intensive heat reduced protein through denaturation and the loss of soluble nitrogenous compounds.

The antioxidant story was equally dramatic. Germinated rice bean flour recorded the highest total phenolic content at 8.42 milligrams of gallic acid equivalents per gram, the highest total flavonoid content at 4.22 milligrams of quercetin equivalents per gram, and a DPPH radical-scavenging activity of 72.67 percent, more than double the 33.19 percent of the soaked control. Freeze-drying nearly matched germination on phenolics, preserving 7.99 milligrams per gram, but showed comparatively low radical-scavenging activity, a discrepancy the authors attribute to the fact that antioxidant capacity depends on the identity and reactivity of individual phenolic compounds rather than their total abundance. Sand roasting and pressure cooking fared worst, with phenolic content dropping to 2.58 and 2.32 milligrams per gram respectively, as thermal degradation, oxidation, and leaching stripped away antioxidant-active constituents.

Functional properties, the traits that determine how a flour behaves in a bakery or beverage formulation, followed their own logic. Pressure cooking produced the highest swelling index, reaching 5.31 grams per gram at 90 degrees Celsius, because gelatinisation disrupts starch crystallinity and lets water flood into the granules. Germination led on almost everything else: water absorption index of 3.20 grams per gram, water solubility of 15.8 percent, water absorption capacity of 8.63 grams per gram, foaming capacity of 32.82 percent, foam stability of 70.02 percent, emulsion capacity of 58.9 percent, and emulsion stability of 76.3 percent. Partial proteolysis during sprouting increases protein solubility and molecular flexibility, boosting surface activity at air-water and oil-water interfaces. Sand roasting, meanwhile, claimed the highest oil absorption capacity at 2.42 grams per gram, as dry heat exposed hydrophobic amino acid residues through partial protein denaturation.

Spectroscopy and X-ray diffraction revealed the structural underpinnings of these changes. Fourier-transform infrared spectra showed that germination and roasting disrupt hydrogen-bonding networks, that pressure cooking unfolds proteins through changes in the amide I and II bands, and that roasting generates carbonyl-containing compounds consistent with tentative Maillard reaction intermediates. XRD analysis confirmed that rice bean starch adopts an A-type crystalline polymorph, with characteristic diffraction peaks near 17, 18, and 23 degrees two-theta. Freeze-drying and soaking preserved that crystalline order almost intact, germination moderately reduced it through amylase-driven hydrolysis, pressure cooking collapsed it entirely through gelatinisation, and sand roasting introduced disorder through thermal dextrinisation. A persistent sharp peak near 80.86 degrees across all treatments pointed to stable inorganic mineral crystallites, likely calcium oxalate or phytate salts, that survive processing untouched.

The practical message is that no single processing method is universally best; each carves out its own application. Germination is the clear winner for nutrition-forward products, delivering maximum protein, phenolics, flavonoids, antioxidant activity, and interfacial functionality. Freeze-drying excels at preserving colour, native starch crystallinity, and thermolabile bioactives, with the lightest flour at a lightness value of 86.16. Pressure cooking suits instant foods that need rapid hydration and swelling, while sand roasting, despite its losses in phenolics, enhances oil binding and retains thermostable metabolites, making it attractive for lipid-rich and savoury formulations. The authors caution that all treatments began from soaked beans, so the reported effects represent changes relative to the soaked state rather than the native seed, and they recommend future studies incorporating raw controls and dual-mode metabolomic analyses. Still, for a crop that supports protein security in the Himalayas and has barely left the region, the study offers a molecular roadmap: with the right processing, rice bean could graduate from subsistence staple to designer ingredient in the fast-growing plant-based food market.

Subject of Research: Effects of processing treatments on the metabolomic, physicochemical, and functional profile of rice bean (Vigna umbellata)

Article Title: Metabolomics reveals the effect of sand roasting, freeze-drying, and different hydrothermal treatments on the physical, functional and bioactive profile of Rice bean ( Vigna umbellata )

Article References: Basumatary, S., Singh, M. K., Hmar, B. Z., Kumar, A., Sugumar, J. K., Aggarwal, A., Mishra, H., Singh, K. A., Yadav, S. S., Kumar, S., & Kumar, V. (2026). Metabolomics reveals the effect of sand roasting, freeze-drying, and different hydrothermal treatments on the physical, functional and bioactive profile of Rice bean (Vigna umbellata). Food Chemistry: X, 39, Article 104553. https://doi.org/10.1016/j.fochx.2026.104553

Image Credits: AI Generated

DOI: 10.1016/j.fochx.2026.104553

Keywords: rice bean, Vigna umbellata, metabolomics, germination, freeze-drying, sand roasting, pressure cooking, antioxidants, flavonoids, legumes, functional foods, starch crystallinity

The logic behind the indicator rests on the peculiar chemistry of anthocyanins, the water-soluble pigments that give red cabbage its deep color. Anthocyanins are molecular chameleons: their structure, and therefore their color, shifts with the acidity of their surroundings. In acidic conditions the pigment exists mainly as a flavylium cation, producing a rose-red hue. As pH rises toward neutral, the molecule equilibrates among several forms, including the quinoidal base and carbinol pseudo base. Above pH 7, deprotonation generates quinoidal structures with extended conjugation that shift absorbed light toward longer wavelengths, and under strongly alkaline conditions the pyran ring cleaves and rearranges into yellow chalcones. The team confirmed this behavior spectroscopically, measuring the total anthocyanin content of their dried cabbage powder at 18.90 milligrams of cyanidin-3-glucoside equivalents per gram of dry matter, and observing the absorption maximum of their extract drift from roughly 500 nanometers under acidic conditions to 600 nanometers as pH climbed from 3 to 12.

Red cabbage is an attractive pigment source because it is cheap, edible, and richer in anthocyanins than many alternative plants, which matters when the indicator will sit inside a food package where dye migration is a safety concern. Synthetic pH dyes can volatilize or leach into food matrices, so natural colorants have become the preferred option for intelligent packaging. But a pigment alone is not enough; it needs a physical platform that exposes it to the air inside the package while holding it in place. The Iranian team chose pectin, the plant polysaccharide best known for setting jam, as that platform. Pectin is built from alpha-1,4-linked D-galacturonic acid units, and its degree of esterification governs how it gels and holds water, allowing it to form the layered macroporous structures needed for aerogel fabrication.

Aerogels are among the lightest solid materials known, produced by replacing the liquid in a gel with gas while preserving the three-dimensional polymer network. To make theirs, the researchers dissolved apple pectin at concentrations of 10, 15, and 20 percent weight per volume, mixed in a diluted red cabbage extract, cast the solutions into molds, froze them in liquid nitrogen, and freeze-dried them at minus 80 degrees Celsius for 48 hours. The resulting indicators were extraordinarily porous: bulk densities ranged from 0.074 to 0.139 grams per cubic centimeter, with porosity between 90 and 95 percent. That internal free volume is the point. A highly porous network adsorbs and retains volatile spoilage gases efficiently, accumulating them near the embedded anthocyanins and amplifying the color response.

The formulation details turned out to matter enormously. Increasing the pectin concentration produced a denser, more cross-linked network: porosity fell, moisture absorption dropped from 16.1 percent to 7.9 percent, and the aerogels became harder, more cohesive, and less springy in texture analysis. Adding the red cabbage extract reinforced this trend, because hydrogen bonding between anthocyanin molecules and pectin chains packed the polymer network more tightly. Fourier-transform infrared spectroscopy revealed the signature of these interactions: the hydroxyl stretching band broadened and shifted to lower wavenumbers in loaded aerogels, while a band near 1623 per centimeter, assigned to the aromatic carbon-carbon skeletons of anthocyanin rings, grew in intensity, confirming that the pigment was genuinely integrated into the matrix rather than merely sitting on its surface. X-ray diffraction showed increased crystallinity in the loaded samples, consistent with closer molecular packing.

When the team exposed the loaded aerogels to ammonia vapor, a stand-in for the volatile bases that escaping from spoiling meat, the materials shifted from red to purple in a time-dependent manner. After 30 minutes of exposure, the 10 percent pectin formulation registered the largest total color difference, a delta E of 27.79, compared with 24.20 for the 15 percent version and 19.95 for the 20 percent version. The explanation is straightforward physics: the denser networks at higher pectin concentrations restricted ammonia diffusion and slowed the anthocyanins’ structural transformation. The 10 percent aerogel, with its lower polymer density, higher porosity, and greater anthocyanin accessibility relative to its pectin content, let the gas reach the pigment fastest and most completely.

The real test came with actual chicken. The researchers sealed 40-gram skinless chicken samples in oriented polypropylene containers, attached the aerogel labels to the inner upper surface without direct meat contact, and stored everything at 4 degrees Celsius for 12 days, measuring pH, total volatile basic nitrogen, lipid oxidation, bacterial counts, and sensory qualities along the way. The meat started fresh, with 3.76 log colony-forming units per gram of total viable count, a pH of 5.25, and TVB-N of 9.6 milligrams of nitrogen per 100 grams. By day 8, those values had reached 7.01 log CFU per gram, 6.577, and 25.61 milligrams per 100 grams respectively, crossing the accepted spoilage thresholds for raw chicken fillets, while odor scores from trained panelists collapsed to the minimum of the hedonic scale.

The labels told the same story in color. The 10 percent pectin indicator transitioned from purple on day 0 to purplish-blue by day 6, marking semi-fresh meat, and turned green during days 8 through 12, signaling advanced spoilage. The 15 and 20 percent formulations lagged, turning purplish-blue on day 8 and green only during days 10 through 12. Critically, the team went beyond visual impressions and ran statistical analyses to determine whether the measured color change could serve as an objective spoilage metric. After controlling for storage time, only the 10 percent pectin aerogel showed significant partial correlations between its delta E values and the key spoilage indicators, total viable count and TVB-N, as well as sensory attributes including color, texture, and overall acceptability. Receiver operating characteristic analysis then established delta E cut-off values of 25.8, 16.9, and 11.1 for the 10, 15, and 20 percent formulations against the microbiological and chemical spoilage thresholds.

Those numbers carry practical weight. A delta E above 5 is generally considered the threshold at which a color change becomes visible to the naked eye, so a cut-off of 25.8 for the best formulation means the label’s color shift is not subtle; it is unmistakable. Because the indicator works passively, responding to the ammonia and other alkaline nitrogenous compounds that protein-degrading bacteria release into the package headspace, it requires no electronics, no reader device, and no cold-chain data infrastructure. A consumer, an inspector, or a warehouse camera could in principle read it. The researchers note that the anthocyanin-to-pectin ratio directly controls both the magnitude of the color response and the delta E threshold at which spoilage is flagged, which suggests the technology can be tuned for different foods and spoilage chemistries.

The study also contributes a useful design principle for the broader field of halochromic food sensors: the support matrix is not a passive carrier but an active determinant of sensitivity. Three-dimensional porous networks enhance sensing performance, but only up to the point where the matrix remains open enough for gases to diffuse. Too much polymer, and the indicator goes blind; too little, and the structure may lack the mechanical integrity to survive handling. The pectin aerogels’ combination of low density, high porosity, and anthocyanin-stabilized mechanical strength appears to hit a workable balance, and the fact that every component, from the cabbage pigment to the fruit-derived polysaccharide, is food-safe removes the migration concerns that have limited synthetic dye indicators. Whether such labels can be manufactured at scale, and whether their response holds up under the temperature fluctuations of real supply chains, remain questions for future work, but the demonstration that a simple, edible aerogel can quantitatively track chicken spoilage in real time marks a concrete step toward packaging that speaks for the food it protects.

Subject of Research: Pectin aerogel colorimetric indicators with red cabbage anthocyanins for real-time monitoring of chicken meat freshness

Article Title: Evaluation of intelligent aerogel indicators composed of red cabbage extract and pectin for monitoring chicken meat freshness

Article References: Shirkhani, H., Emamifar, A., & Davati, N. (2026). Evaluation of intelligent aerogel indicators composed of red cabbage extract and pectin for monitoring chicken meat freshness. Food Chemistry: X, Article 104615. https://doi.org/10.1016/j.fochx.2026.104615

Image Credits: AI Generated

DOI: 10.1016/j.fochx.2026.104615

Keywords: intelligent packaging, aerogel, anthocyanins, red cabbage extract, pectin, chicken meat freshness, colorimetric indicator, food spoilage, TVB-N, total viable count, freeze-drying, halochromic sensor

The chemistry behind this promise is striking. Immunoglobulins, chiefly IgG, make up roughly 70 to 80 percent of the total protein in first-day colostrum, and their concentration can reach 50 to 100 milligrams per milliliter in the first days after delivery, orders of magnitude above the levels found in mature milk. Total protein in day-one colostrum approaches 15 percent by weight before falling to around 3 percent within days. Alongside the antibodies sit lactoferrin, an iron-binding glycoprotein with antibacterial, antiviral and anti-inflammatory activity; lactoperoxidase, an enzyme that generates reactive compounds lethal to a broad range of bacteria; and growth factors such as IGF-1 and TGF-beta that drive epithelial repair and tissue regeneration. Proline-rich polypeptides add a further layer of immune regulation, capable of damping down overactive responses of the kind seen in allergy and autoimmunity.

What makes bovine colostrum particularly attractive compared with colostrum from other species is a combination of potency, abundance and cross-species compatibility. The IgG concentration in bovine colostrum is nearly 100 times higher than in human colostrum, and many of its bioactive molecular structures are conserved across mammals, allowing bovine-derived molecules to interact effectively with human receptors. Dairy cows also produce far more colostrum than a calf can consume, creating a renewable surplus that can be harvested without compromising animal welfare. Regulatory agencies in several countries already recognize bovine colostrum as a generally safe natural nutraceutical ingredient, and its production is scalable in a way that human, goat or camel colostrum simply is not.

The carbohydrate fraction of colostrum is proving equally interesting. Bovine colostrum contains between 0.7 and 1.2 milligrams per milliliter of oligosaccharides, the majority of them acidic, sialylated structures such as 3′-sialyllactose, which accounts for about 70 percent of the total. Forty distinct oligosaccharide compositions have been identified so far, and their levels peak immediately after parturition before declining within 48 hours. Unlike the predominantly fucosylated oligosaccharides of human milk, bovine milk oligosaccharides are mostly sialylated, and recent advances in enzymatic glycosylation are making it possible to modify their structures to resemble human milk oligosaccharides more closely. Glycoproteins such as the casein-derived glycomacropeptide add prebiotic value, promoting the growth of beneficial Bifidobacterium in the gut.

Turning this perishable fluid into a stable commercial ingredient is a technological challenge in its own right, and the review devotes considerable attention to processing science. Freeze-drying, or lyophilization, is described as the gold standard: by freezing colostrum and removing water through sublimation under reduced pressure, the process avoids the heat that would denature thermolabile proteins. Freeze-dried colostrum retains 85 to 95 percent of original IgG activity, and with cryoprotectants such as trehalose or maltodextrin, probiotic survival rates of 80 to 90 percent can be achieved. Spray-drying, by contrast, is the workhorse of industrial production, atomizing liquid colostrum into hot air at inlet temperatures of 140 to 180 degrees Celsius. Although somewhat harsher, optimized spray-drying can still preserve 70 to 80 percent of immunoglobulin activity while dramatically reducing microbial load and extending shelf life, which is why it remains the method of choice for large-scale manufacturing.

Clinical evidence is accumulating across a surprising range of conditions. In gastrointestinal medicine, colostrum has shown benefit in irritable bowel syndrome, ulcerative colitis and infectious diarrhea. A small pilot trial of a colostrum enema in ulcerative colitis saw symptom improvement in seven of eight treated patients, and hyperimmune colostrum tablets targeting enterotoxigenic E. coli provided roughly 90 percent protection against experimentally induced traveler’s diarrhea in challenge studies. Perhaps most striking is the interaction with painkillers: in a crossover trial, volunteers taking the NSAID indomethacin alongside whey protein saw intestinal permeability rise nearly threefold, whereas those co-administered bovine colostrum showed no significant increase at all, an effect attributed to growth factors that promote healing of the gut lining.

Athletes form another key target population. The first study of colostrum supplementation in sport, published in 1997, reported increases in serum immunoglobulin concentrations and explosive muscular power. Subsequent controlled trials have found improvements in lean body mass, cycling performance and recovery in runners, and one study of older adults undergoing resistance training showed enhanced leg press strength and reduced bone resorption at a dose of 60 grams per day. Supplementation has also been linked to reduced exercise-induced gut permeability and, in some studies, elevated secretory IgA in saliva, although these immune findings have not always been replicated. Researchers caution that the mechanisms remain unclear and that the effects probably cannot be explained by protein content alone, since whey protein controls with matching protein levels generally perform less well.

The newest frontier comes from omics technologies. Proteomic profiling has identified more than a thousand distinct proteins and peptides in bovine colostrum, revealing low-abundance bioactives such as osteopontin, milk fat globule membrane proteins and lactoperoxidase that participate in immune signaling, mucosal defense and tissue repair. Even more provocative is the discovery of microRNAs packaged within stable extracellular vesicles. These small regulatory RNAs, including miR-148a and miR-21, appear capable of surviving passage through the digestive tract and influencing gene expression in recipient cells, modulating T-cell differentiation, macrophage activation and the integrity of tight junctions in the intestinal barrier. Some evidence suggests these molecules may even cross species barriers, adding an epigenetic dimension to colostrum’s bioactivity that extends well beyond its traditional protein and peptide mechanisms.

The review is careful to balance enthusiasm with caution. Colostrum’s bioactive content varies substantially between batches depending on breed, diet, parity and collection time, raising standardization and labeling concerns in loosely regulated markets. Milk protein allergy and lactose intolerance remain relevant risks for sensitive individuals, and fresh colostrum is highly perishable and prone to contamination with pathogens such as E. coli, Salmonella and Listeria unless properly pasteurized or dried. Theoretical questions also persist about long-term exposure to concentrated growth factors, particularly for people with hormone-sensitive conditions, and the authors call for larger, well-designed, double-blind and placebo-controlled trials to confirm many of the reported clinical benefits.

Nevertheless, the overall trajectory is unmistakable. From functional foods and infant nutrition to sports supplements and pharmaceutical formulations, bovine colostrum is being repositioned as a multifunctional bioactive matrix rather than a simple dairy byproduct. New encapsulation and delivery systems are being developed to improve the bioavailability and targeting of its fragile components, and metabolomic and transcriptomic studies continue to uncover candidates with antiviral and immunomodulatory potential. As consumer demand shifts toward natural products with immune-enhancing and regenerative properties, the review concludes that this ancient first milk, once valued only for the survival of newborn calves, may become a staple ingredient of future functional nutrition and therapeutic development, provided that quality control, sustainable sourcing and processing standardization keep pace with the science.

Subject of Research: Nutritional composition, bioactive components and therapeutic applications of bovine colostrum

Article Title: Health benefits and value addition of bovine colostrum (BC): a comprehensive review of its nutritional and functional potential

Article References: Riaz, S., Imran, A., Rasheed, M., Amjad, A., Shankar, A., Chauhan, G., Basharat, Z., Islam, F., Naeem, U., & Ndagire, C. T. (2026). Health benefits and value addition of bovine colostrum (BC): a comprehensive review of its nutritional and functional potential. Food Science of Animal Resources, 46(1), Article 55. https://doi.org/10.1007/s44463-026-00057-w

Image Credits: AI Generated

DOI: 10.1007/s44463-026-00057-w

Keywords: bovine colostrum, immunoglobulins, lactoferrin, growth factors, gut health, functional foods, nutraceuticals, freeze-drying, spray-drying, microRNAs, immune modulation, sports nutrition

The team, led by Traiphop Phahom of Suranaree University of Technology together with Kamolwan Soubsub, Gaelle Roudaut, and Singhanat Phoungchandang, harvested flowers from a farm in Buriram province, Thailand, in March and April 2024. Petals were separated by hand, cut into half-centimeter strips, frozen at minus 20 degrees Celsius, and thawed slowly overnight to ensure a uniform starting material. They then compared three approaches: conventional convective hot-air drying at 50, 60, and 70 degrees Celsius; intermittent microwave drying at 450, 720, and 900 watts; and freeze drying, which served as the gold-standard control because its low temperatures and vacuum conditions minimize thermal and oxidative damage.

The speed difference was staggering. Convective drying took between 6,120 and 12,420 seconds, meaning up to nearly three and a half hours of continuous heat exposure. Intermittent microwave drying finished in just 220 to 340 seconds, roughly a 97 percent reduction in processing time. Raising the air temperature from 50 to 70 degrees Celsius cut convective drying time by about half, while increasing microwave power from 450 to 900 watts shortened it by roughly a third. Drying rates under microwaves ran about twenty times higher than under hot air, a consequence of volumetric heating: microwaves generate heat inside the tissue itself, creating strong internal vapor pressure gradients that drive moisture outward far faster than surface convection ever could.

To describe this behavior mathematically, the researchers fitted their data to five classical thin-layer drying models, including Newton, Page, and Fick’s second law. The Midilli-Kucuk model emerged as the clear winner, achieving coefficients of determination of at least 0.999 with the lowest error statistics across every condition. Effective moisture diffusivity, calculated from Fick’s law, ranged from about 1.7 times ten to the minus seventh square meters per second under hot air to nearly 7 times ten to the minus sixth under microwaves, roughly a twenty-five-fold difference. Arrhenius-type analysis yielded an activation energy of 28.05 kilojoules per mole for convective drying and 16.05 watts per gram for microwave drying, parameters that quantify how sensitively water movement responds to temperature or power, respectively.

Structure and color told their own story. Using image analysis, the team tracked shrinkage in two phases: a rapid collapse early in drying, accounting for 83 to 95 percent of total shrinkage, followed by a slower plateau. Microwave-dried petals shrank less overall, between 51.1 and 54.1 percent, than hot-air samples, which lost up to 62.6 percent of their original area. The explanation lies in heat transfer physics. Slow convective drying lets a dry, hard crust form at the surface while the interior stays above its glass transition temperature longer, promoting cellular collapse. Rapid microwave heating, by contrast, generates internal vapor pressure that can temporarily prop up the cellular structure and even create porosity. Freeze-dried petals kept the highest lightness and the strongest red-purple hue, while both heat-based methods pushed the petals toward brown and dark-brown tones through nonenzymatic browning, with the mildest hot-air treatment at 50 degrees Celsius showing the smallest total color difference.

Antioxidant assays revealed a nuanced hierarchy. Freeze drying and the hottest convective treatment at 70 degrees Celsius produced the highest total phenolic content, at up to 139.54 milligrams of gallic acid equivalents per gram of dry weight, likely because rapid moisture removal curtailed enzymatic oxidation while cell wall damage improved extractability. For flavonoids, moderate microwave power at 450 watts actually beat freeze drying, reaching 148.09 milligrams of quercetin equivalents per gram. Radical-scavenging and ferric-reducing activities followed a similar pattern: freeze drying led, low-to-moderate microwave power came close, and prolonged hot-air drying scored lowest. The culprit for convective drying is cumulative exposure, which enables enzymatic oxidation by polyphenol oxidase, thermal degradation of phenolic structures, and oxidative polymerization. Excessive microwave power at 900 watts also backfired, as localized overheating degraded heat-sensitive compounds, confirming that lower power offers the best balance between speed and preservation.

The most technically ambitious part of the study was metabolite profiling by liquid chromatography coupled to high-resolution quadrupole time-of-flight mass spectrometry. Across seven drying conditions analyzed in triplicate, the team annotated 125 phenolic compounds, about half of all detected metabolites, divided into 81 flavonoids, 25 phenolic acids, 14 tannins, and 5 stilbenes, all at confidence level 2 of the Metabolomics Standards Initiative. Compounds such as ellagic acid, quercetin, kaempferol-3-glucoside, delphinidin-3-glucoside, and isorhamnetin correlated strongly with antioxidant activity. Intriguingly, the phenolic acid class correlated negatively with the classic Folin-Ciocalteu total phenolic measurement, a finding the authors attribute to the assay’s nonspecific response to any reducing compound, including Maillard reaction products formed during thermal drying. The lesson is that colorimetric assays measure total reducing capacity, not true phenolic content, and only compound-specific profiling can resolve what drying actually does to individual molecules.

Moisture sorption behavior, critical for shelf life, was measured with a dynamic vapor sorption analyzer at 25 degrees Celsius across relative humidities from 0 to 90 percent. The isotherms showed the classic Type II sigmoid shape, with more than half of the total moisture uptake occurring above a water activity of 0.75, driven by hydrophilic carbohydrates, proteins, and fiber. Among four sorption models tested, the Peleg model fit best, while the BET model estimated monolayer moisture contents of roughly 4.1 to 4.8 percent dry basis, the level at which dried foods are most stable. By setting water activity to 0.6, the conventional upper limit for safe storage of dried foods, the researchers calculated a critical moisture content of 10.75 to 11.40 percent dry basis, meaning the petals remain stable as long as moisture is kept below about 10 percent.

Hierarchical cluster analysis, validated by a cophenetic correlation coefficient of 0.93, grouped the treatments into three distinct clusters: freeze drying alone, all hot-air conditions, and all microwave conditions. Crucially, the microwave cluster sat closer to freeze drying in the quality space than the hot-air cluster did, indicating that microwaves better preserve the physicochemical and bioactive character of the petals. Within the microwave family, 450 and 720 watts offered the most favorable compromise between quality retention and processing speed. The practical implication is significant for the nutraceutical, functional food, and natural colorant industries: intermittent microwave drying could serve as a fast, energy-efficient alternative to expensive freeze drying for heat-sensitive botanical materials. The authors note that metabolite identities remain tentative until confirmed with authentic standards, and they call for long-term storage stability studies and formulation trials to carry red water lily petals from the pond to the product shelf.

Subject of Research: Effects of drying technologies on metabolite profile, drying kinetics, quality retention, and moisture sorption of red water lily petals

Article Title: Shaping metabolite profile, dehydration kinetics, quality retention, and sorption properties of red water lily ( Nymphaea x rubra ) petals through drying technology

Article References: Phahom, T., Soubsub, K., Roudaut, G., & Phoungchandang, S. (2026). Shaping metabolite profile, dehydration kinetics, quality retention, and sorption properties of red water lily (Nymphaea x rubra) petals through drying technology. Journal of Agriculture and Food Research, 31, Article 103337. https://doi.org/10.1016/j.jafr.2026.103337

Image Credits: AI Generated

DOI: 10.1016/j.jafr.2026.103337

Keywords: red water lily, Nymphaea x rubra, microwave drying, freeze drying, convective drying, antioxidants, phenolic compounds, flavonoids, metabolite profiling, LC-MS, moisture sorption isotherm, food drying

The review begins by distinguishing the vocabulary of flavor science. Flavor encompasses the overall sensory perception of food, including taste, touch, smell, sight, and even sound, while aroma refers specifically to the odor detected by the olfactory system. The compounds responsible range from naturally occurring phenolics, terpenoids, alcohols, esters, ketones, and pyrazines found in essential oils, spices, and citrus peels, to synthetic molecules engineered to mimic smoky, citrus, fruity, buttery, or caramel notes. Many of these molecules carry bonus biological activity, including antioxidant, anticancer, anti-inflammatory, and immune-boosting properties. But their volatility is their undoing. In products such as cookies and bread, flavors can be lost during baking or develop off-notes, which is why manufacturers increasingly turn to encapsulation, the practice of wrapping active compounds in protective carrier materials that shield them from degradation, delay their release, prevent oxidation, and ultimately enhance the eating experience.

Encapsulation operates across macro, micro, and nano scales, from capsules larger than 5,000 micrometers down to structures of just 1 to 100 nanometers. While the microscale dominates the food industry today, the review highlights growing evidence that nanoencapsulation offers superior stability, better controlled release, enhanced solubility in liquids, and improved penetration through biological barriers. The conventional toolbox includes physicochemical methods such as coacervation and emulsification, physicomechanical methods such as spray drying and freeze drying, and chemical methods based on polymerization and cross-linking. Each technique produces capsules that differ in size, morphology, release profile, and stability, and the authors stress that no single method is universally superior. Selection depends on the chemistry of the flavor compound, the carrier material, the intended food application, economic constraints, and production scale rather than encapsulation efficiency alone.

Spray drying remains the most widely applied industrial technique, prized for its simplicity, low cost, scalability, and high throughput. In this process, a flavor is dissolved or dispersed in a carrier matrix, atomized into a heated drying chamber, and rapidly converted into spherical particles, often under nitrogen to prevent oxidation. The review cites strawberry flavor encapsulation achieving 85 percent efficiency using maltodextrin, modified starch, and gum arabic at an inlet temperature of 190 degrees Celsius, yielding microcapsules with roughly 90 percent solubility. Yet the method has a critical weakness: retention of volatiles varies enormously with molecular weight. High-carbon volatiles may retain up to 95 percent of their aroma, while low-molecular-weight compounds such as acetaldehyde may retain as little as 20 percent, creating potential inconsistencies between liquid and powdered flavor versions. Powder adhesion to equipment and thermal reactions further complicate the picture, and most studies remain at laboratory scale with limited data on real processing conditions and long-term storage.

The cooler alternatives each carry their own trade-offs. Spray chilling, which solidifies lipid-encapsulated flavors in a cooling chamber at 34 to 42 degrees Celsius, minimizes thermal degradation and suits heat-sensitive compounds, but it is restricted to lipid-based carriers and requires flavors to remain stable at the lipid melting point. Applications include coating the potent aroma compound 2-acetyl-1-pyrroline with paraffin for stability and masking bitter plant extracts for dark chocolate. Freeze drying, which removes water by sublimation, excels at preserving heat-sensitive compounds and creates porous structures that facilitate controlled release, but its high energy consumption, long processing times, and cost confine it largely to high-value products such as coffee and spices. In a comparative study of chamomile extract, freeze drying better preserved total polyphenol content, yet spray drying achieved higher encapsulation efficiency of about 90 percent versus 84 percent, underscoring that the optimal choice depends on the core material and the priorities of the manufacturer.

Coacervation occupies a middle ground, forming micro- or nanocapsules by depositing proteins or polysaccharides around flavor droplets in an emulsion. It can encapsulate both hydrophilic and hydrophobic compounds at room temperature, protecting heat-sensitive flavors and achieving impressive efficiencies, with recent reports of cinnamon extract encapsulation in alginate reaching up to 97 percent while masking undesirable flavors. However, the process is notoriously sensitive to pH, ionic strength, polymer molecular weight, and solvent properties, which can produce variable particle sizes, aggregation, and elevated costs. The review notes that systematic studies of how the molecular characteristics of flavor compounds, such as electrical charge and hydrophobicity, influence coacervate formation remain limited, and calls for predictive models to improve reproducibility and industrial applicability.

Against this backdrop, electrospinning has emerged as the review’s most compelling alternative. The technique applies a high-voltage electrostatic field to a polymer solution containing the flavor, stretching it into elongated fibrous structures with diameters ranging from nanometers to micrometers, high surface-area-to-volume ratios, and interconnected porosity. Because the process operates under mild conditions without high temperatures, pressure, or harsh chemicals, it preserves the structural and sensory integrity of volatile compounds. Two advanced variants, emulsion electrospinning and coaxial electrospinning, produce core-shell fibers in which the aromatic compound is physically confined to the inner core and surrounded by an outer polymer layer, reducing contact with the environment and limiting burst release. Shell thickness, core-to-shell flow ratio, and polymer hydrophobicity can be tuned to precisely control release kinetics. Reported encapsulation efficiencies are striking: thyme essential oil in potato starch nanofibers reached 99 percent, saffron in gelatin reached 96 percent, and thymol in pullulan-whey composites reached 87 percent with release targeted to the small intestine.

The practical applications documented in the review read like a preview of future food packaging. Electrospun polyvinyl alcohol nanofibers loaded with laurel and rosemary essential oils reduced lipid oxidation in chicken breast fillets by up to 68 percent while improving microbial and color stability. Gelatin-chitosan nanofibers carrying thyme essential oil showed bactericidal activity against Clostridium perfringens in sausages, suggesting a viable alternative to nitrite. Polycaprolactone nanofibers incorporating lemon essential oil and a metal-organic framework extended the shelf life of red meat at 4 degrees Celsius by up to 18 days, and a bilayer acorn starch-zein film with cinnamon essential oil extended the shelf life of rainbow trout fillets by six days while cutting lipid oxidation by 44 percent. Perhaps most intriguingly, stimulus-responsive systems are now being designed to release flavors only when triggered by light, pH shifts, temperature, humidity, or even the spoilage enzymes secreted by contaminating microbes, enabling packaging that actively responds to the state of the food it protects.

Significant hurdles remain before electrospinning can displace conventional methods at scale. Production throughput is low, scalability is difficult, the range of food-grade solvents is limited, and the process is sensitive to parameters such as voltage, viscosity, humidity, and flow rate, with even small changes altering fiber morphology and release kinetics. Regulatory approval of a polymer in bulk form does not automatically extend to its nanofibrous form, because electrospinning can alter conformation, crystallinity, surface area, and degradation behavior, and data on gastrointestinal fate and long-term toxicity of electrospun nanostructures are sparse. The review concludes that electrospinning should be viewed as a complementary technology that expands the encapsulation toolkit rather than a universal replacement, and it calls for validation in real food matrices, predictive computational models including machine learning, greener solvent systems such as natural deep eutectic solvents, and comprehensive sensory and consumer studies. If those challenges are met, the fibers now spinning in laboratories could soon deliver aroma exactly when and where the palate demands it.

Subject of Research: Controlled-release encapsulation technologies for aromatic and flavor compounds in food systems

Article Title: Recent Advances in Technologies for the Controlled Release of Aromatic Compounds: From Encapsulation to Electrospinning

Article References: Mojarad, M., Shiravani, Z., Abedi, E., Jafarpour, D., Sayadi, M., & Bagher Hashemi, S. M. (2026). Recent Advances in Technologies for the Controlled Release of Aromatic Compounds: From Encapsulation to Electrospinning. Current Research in Food Science, Article 101586. https://doi.org/10.1016/j.crfs.2026.101586

Image Credits: AI Generated

DOI: 10.1016/j.crfs.2026.101586

Keywords: encapsulation, electrospinning, flavor compounds, aromatic compounds, controlled release, spray drying, freeze drying, coacervation, nanofibers, essential oils, food packaging, food science

The team, led by Sejun Park and corresponding author Mi-Jung Choi, used Leuconostoc mesenteroides, a lactic acid bacterium common in fermented foods, embedded in matrices built from whey protein isolate combined with either lactose or inulin. Whey protein isolate provides a protein scaffold, but the carbohydrate component determines much of the matrix’s thermal and hygroscopic behavior. The researchers deliberately manipulated how the samples were frozen before freeze-drying, because the freezing step sets the physical state of the solid matrix that will ultimately shelter the cells.

Two freezing protocols were compared. In the first, samples were plunged directly to −100°C in a single step. In the second, a two-step protocol first held the samples at −5°C, a temperature that encourages ice nucleation and slow crystal growth, before finishing at −100°C. In some experiments the nucleation step was seeded to control when ice crystals formed. X-ray diffraction and Fourier-transform infrared spectroscopy then revealed what each treatment had wrought: unseeded one-step freezing produced predominantly amorphous matrices, disordered solids in which molecules are frozen in place like a snapshot of the liquid state, whereas seeded two-step freezing produced matrices with clear crystalline features and a higher degree of molecular organization.

That distinction matters because amorphous and crystalline solids behave very differently toward water. Differential scanning calorimetry measured the glass transition temperature, the threshold at which an amorphous solid softens from a rigid glass into a rubbery, mobile state. Water sorption experiments tracked how much moisture each matrix absorbed at different relative humidities, and Gordon–Taylor analysis quantified how strongly that absorbed water depressed the glass transition temperature. Water is a notorious plasticizer: even small amounts slip between macromolecules, lowering the transition temperature and unlocking molecular motion that was previously locked out by the glass.

The carbohydrate identity proved decisive here. Lactose-based matrices were far more sensitive to water-induced glass transition depression, sagging toward rubbery behavior at comparatively modest moisture gains. Inulin-based matrices, by contrast, retained their glass transition temperature much more effectively and showed lower plasticization. Inulin, a longer-chain fructose polymer, simply holds its glassy character better in the presence of water, a property that has been exploited in other dried food and pharmaceutical systems but is now quantified here in the specific context of probiotic preservation with whey protein isolate.

The consequences for the bacteria were stark. Immediately after freeze-drying, cells housed in glassy matrices had lost only 0.50 to 0.70 log units of viability, while cells in crystalline matrices lost 2.48 to 2.65 log units, a difference of roughly two orders of magnitude in surviving colony-forming units. The crystallization process itself appears to be the culprit: as the matrix organizes into crystals, it expels and concentrates solutes, generates mechanical stresses, and strips away the intimate molecular contact that sugars and proteins need to stabilize bacterial membranes and proteins during drying. A crystal lattice, however orderly, is a poor bodyguard.

Storage told a parallel story. Over the storage period, glassy matrices continued to protect their cargo, with viability losses of only 0.41 to 0.77 log units, whereas crystalline matrices shed another 1.71 to 1.87 log units. The mechanism linking these numbers is molecular mobility. When absorbed water depresses the glass transition temperature toward or below the storage temperature, the matrix enters a rubbery regime in which molecules can diffuse, rearrange, and collide. In that regime, damaging reactions accelerate, and the physical barriers that immobilize and shield bacterial cells break down. The Williams–Landel–Ferry equation, a standard model for how relaxation times accelerate as temperature rises above the glass transition, connected the measured transition depressions directly to the observed inactivation rates.

What makes the study technically notable is that it treats the freezing protocol, the carbohydrate chemistry, and the storage environment as one coupled system rather than isolated variables. The degree of crystallinity imprinted during freezing determines the initial physical state; the carbohydrate type determines how fast that state degrades under humidity; and the WLF framework ties the resulting molecular mobility to bacterial death. This chain of causation gives formulators a set of levers: freeze in a way that preserves the amorphous glass, choose carbohydrates such as inulin that resist water plasticization, and package to keep moisture out, and the same probiotic strain can be expected to survive dramatically longer.

The findings arrive at a moment when probiotic powders, functional foods, and microbiome therapies are a fast-growing market, and shelf stability remains a persistent bottleneck. Live bacteria are fragile cargo, and the industry has long relied on empirical trial and error to find protective formulations. By showing that the glassy state, quantified through calorimetry, sorption isotherms, and spectroscopy, is a predictive criterion for both drying survival and storage survival, the Konkuk team adds rigor to what has often been craft knowledge. The work also echoes and extends earlier observations that dried bacterial cells survive in proportion to how deeply their surroundings are locked below the glass transition.

There are, of course, practical caveats. The study examined one organism and one protein-carbohydrate platform, and real products face fluctuating temperatures and humidities that no single isotherm can capture. Crystalline matrices, for all their poor performance here, may offer advantages in other contexts, such as controlled release or reduced hygroscopicity. But the central message is hard to escape: for freeze-dried probiotics, the enemy is not cold or vacuum but mobility, and mobility is water’s gift. Keep the matrix glassy, keep it dry, and the bacteria keep their count. The research was supported by the Basic Research Program of the National Research Foundation of Korea, funded by the Ministry of Education.

Subject of Research: Stability of freeze-dried probiotics in whey protein isolate-carbohydrate matrices as governed by matrix physical state and water-induced molecular mobility

Article Title: Matrix physical state and water-induced molecular mobility influence the stability of freeze-dried probiotics in whey protein isolate-carbohydrate matrices

Article References: Park, S., Kim, J., Song, H., Kim, S.-H., Jo, Y.-J., & Choi, M.-J. (2026). Matrix physical state and water-induced molecular mobility influence the stability of freeze-dried probiotics in whey protein isolate-carbohydrate matrices. Food Science and Biotechnology. https://doi.org/10.1007/s10068-026-02315-5

Image Credits: AI Generated

DOI: 10.1007/s10068-026-02315-5

Keywords: freeze-drying, probiotics, glass transition temperature, molecular mobility, whey protein isolate, inulin, lactose, Leuconostoc mesenteroides, water plasticization, X-ray diffraction, differential scanning calorimetry, WLF model

The elegance of the new work lies not in a single breakthrough component but in how three functions are folded into one material. Nitrogen-doped graphene quantum dots, tiny carbon-based nanocrystals just a few nanometers across, act simultaneously as emulsion stabilizers, structural templates, and electronic partners to the polymer. This triple duty is what allows the team to build a monolithic, hierarchically porous architecture in which every pore serves light harvesting, buoyancy, and charge separation at once. Previous attempts at floating photocatalysts have typically required separate additives, coatings, or support structures to achieve each of these properties, which introduces interfaces that degrade over time and complicates manufacturing. By contrast, the Korean-Chinese collaboration demonstrates that a single interfacial nanomaterial can orchestrate the entire fabrication process from start to finish.

The fabrication strategy centers on a Pickering emulsion, a type of emulsion stabilized not by molecular surfactants but by solid particles that anchor themselves at the interface between two immiscible liquids. In this case, the researchers dispersed water droplets into chloroform containing dissolved P3HT, and the nitrogen-doped graphene quantum dots settled onto the surface of each water droplet, forming a protective particulate shell. Such Pickering systems are prized in materials chemistry because the particle shells are far more robust than conventional surfactant layers; they resist coalescence and can withstand temperature swings that would destroy ordinary emulsions. That robustness proved essential for the next step, because the team needed the droplet templates to survive freezing intact. When the emulsion was frozen, the water droplets turned into ice spheres encased in quantum-dot-stabilized shells, each one a miniature mold waiting to define the final pore structure.

Freeze-drying, also known as lyophilization, then transformed the frozen architecture into the finished sponge. As the ice sublimated directly from solid to vapor, it left behind spherical cavities arranged in an interconnected three-dimensional network, while the P3HT polymer consolidated into the walls between the pores. The result is a lightweight monolith riddled with spherical voids of controlled size, a structure that materials scientists call an inverse opal-like or ice-templated porous network. Because the pores connect to one another, vapor and gas can move freely through the sponge, and because the walls are made of a light-absorbing conjugated polymer, every internal surface participates in photocatalysis. The hierarchical porosity also dramatically reduces the material’s effective density, which is precisely what allows it to float rather than sink in water.

Buoyancy alone, however, would be of limited value if the floating catalyst could not manage the electrons it generates. Photocatalytic water splitting depends on a delicate sequence: a photon is absorbed, an electron is promoted to an excited state, and that electron must travel to a catalytic site to reduce protons into hydrogen gas before it recombines with the hole it left behind. In pristine P3HT, recombination is rapid and wasteful. The nitrogen-doped graphene quantum dots change this picture fundamentally. Because the quantum dots are n-type electron conductors while P3HT is a classic p-type hole conductor, their intimate contact forms a p-n heterojunction at the nanoscale. At such a junction, the built-in electric field sweeps electrons and holes in opposite directions, dramatically extending their lifetimes and increasing the probability that each absorbed photon contributes to hydrogen production.

The performance numbers reported in the study make a compelling case for this dual design. The pristine P3HT sponge, already benefiting from its porous floating architecture, achieved a hydrogen evolution rate of 2.28 millimoles per gram per hour. Adding the quantum dots and thereby constructing the heterojunction lifted that figure to 7.16 millimoles per gram per hour, a 3.14-fold enhancement. The authors attribute this gain to the synergy between structure and electronics: the porous architecture maximizes light capture and interfacial contact with water, while the p-n junction suppresses charge recombination. Neither contribution alone would produce the observed result, and it is precisely this combination that the Pickering ice-templating strategy makes possible in a single, seamless monolith.

The optical behavior of the sponge deserves particular attention, because it illustrates how geometry can be exploited as a photonic tool. When sunlight strikes the floating sponge, it does not simply pass through or reflect off the surface. Instead, the interconnected spherical cavities act as multiple scattering centers, bouncing light internally from wall to wall and dramatically increasing the optical path length within the material. Each bounce offers another opportunity for absorption by the P3HT, so the sponge harvests a far greater fraction of the incident solar flux than a flat film of the same polymer ever could. Meanwhile, the sponge settles into a state of partial submersion at the air-water interface, with its upper surface exposed to full illumination and its lower, water-flooded pores in direct contact with the reactant. This configuration resolves a classic trade-off in photocatalysis, where catalysts that float well often struggle to access water, and catalysts that access water well tend to sink away from the light.

The broader significance of the work extends beyond the specific material system. Organic photocatalysts such as P3HT are attractive because they are processable from solution, tunable at the molecular level, and free of the scarce and expensive noble metals that plague many inorganic photocatalysts. Yet they have struggled to compete on stability and efficiency. By demonstrating that a Pickering emulsion combined with ice templating can produce a robust, self-floating, charge-separating organic monolith, the researchers have established a versatile fabrication platform that could, in principle, accommodate other polymer-nanomaterial pairings. The quantum dots themselves are inexpensive carbon-based materials, and nitrogen doping enhances their electronic properties and interfacial affinity, suggesting a relatively low-cost pathway to scalable production. The method requires no exotic equipment, only careful control of emulsion formulation and freezing conditions, which bodes well for translation from laboratory bench to pilot-scale solar reactors.

Challenges naturally remain before such sponges can contribute meaningfully to a hydrogen economy. Sustained operation under real sunlight, with fluctuating intensity, temperature swings, and water impurities, will demand long-term stability data that laboratory tests under simulated illumination only begin to address. The overall solar-to-hydrogen conversion efficiency, the metric that ultimately determines economic viability, will need to climb further, and sacrificial electron donors or co-catalysts may still be required depending on the operating conditions. Nevertheless, the conceptual advance is substantial. Floating photocatalysts that combine stable buoyancy, interconnected porosity, and efficient charge separation in one monolithic platform have, as the authors note, remained elusive until now. The Pickering-enabled ice-templating strategy changes that calculus, offering a general recipe for air-water interface photocatalysis.

As the world races toward carbon-free energy, innovations like this floating sponge remind us that progress often comes from rethinking fundamentals rather than simply scaling existing designs. By asking why photocatalysts must sink, and then engineering a material that refuses to, the Korea University and Tianjin University team has turned a mundane physical limitation into an opportunity for photonic and electronic engineering. Their hydrogen evolution rates are impressive, but the deeper legacy may be the fabrication philosophy itself: let a humble emulsion droplet do the architectural work, let ice carve the pores, and let a nanoscale heterojunction handle the electrons. If solar hydrogen is to flow from ordinary water under ordinary sunlight, materials that work with the interface rather than against it, like the P3HT and nitrogen-doped graphene quantum dot sponge, may well point the way forward.

Subject of Research: Pickering emulsion ice-templated self-floating P3HT/nitrogen-doped graphene quantum dot photocatalysts for solar hydrogen evolution

Article Title: Pickering-enabled ice-templated self-floating photocatalysts for hydrogen evolution

Article References: Song, Y., Park, J. K., Heo, J. H., & Im, S. H. (2026). Pickering-enabled ice-templated self-floating photocatalysts for hydrogen evolution. Advanced Composites and Hybrid Materials. https://doi.org/10.1007/s42114-026-02098-7

Image Credits: AI Generated

DOI: 10.1007/s42114-026-02098-7

Keywords: photocatalysis, hydrogen evolution, Pickering emulsion, ice-templating, P3HT, graphene quantum dots, p-n heterojunction, floating photocatalyst, solar fuels, porous materials, freeze-drying, water splitting